{"title":"Polysilazane/micro-arc oxidation pore-sealing composite coatings to protect magnesium alloys from corrosion","authors":"Han Yan, Xuejun Cui, Hongxia Zhu, Yuming Qi, Xingyou Chen, Qingchuan Ren","doi":"10.1007/s11998-024-01038-8","DOIUrl":null,"url":null,"abstract":"<div><p>The microporosity of micro-arc oxidation (MAO) coatings hindered their application on magnesium alloys. Here, the polysilazane (PSZ) was used to seal the pores of MAO coatings by spraying, creating a corrosion-resistant MAO/PSZ composite coating on AZ31B Mg alloy. The active groups (Si–N) in the PSZ layer hydrolyzed in the presence of moisture and they typically cured at elevated temperatures to form a solid ceramic layer. Its morphology, hydrophobicity, corrosion resistance and other properties were studied in detail. The PSZ formed a hydrophobic pore-sealing layer on the MAO layer with high bond strength. Moreover, the self-corrosion current density of the coating was significantly reduced (2.95 × 10<sup>–5</sup> μA/cm<sup>2</sup>), indicating enhancement of the corrosion protection ability. This is attributed to the dense and strong Si–O pore-sealing layer formed by the PSZ polymer on MAO.</p></div>","PeriodicalId":619,"journal":{"name":"Journal of Coatings Technology and Research","volume":"22 3","pages":"1131 - 1144"},"PeriodicalIF":2.3000,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Coatings Technology and Research","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11998-024-01038-8","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
The microporosity of micro-arc oxidation (MAO) coatings hindered their application on magnesium alloys. Here, the polysilazane (PSZ) was used to seal the pores of MAO coatings by spraying, creating a corrosion-resistant MAO/PSZ composite coating on AZ31B Mg alloy. The active groups (Si–N) in the PSZ layer hydrolyzed in the presence of moisture and they typically cured at elevated temperatures to form a solid ceramic layer. Its morphology, hydrophobicity, corrosion resistance and other properties were studied in detail. The PSZ formed a hydrophobic pore-sealing layer on the MAO layer with high bond strength. Moreover, the self-corrosion current density of the coating was significantly reduced (2.95 × 10–5 μA/cm2), indicating enhancement of the corrosion protection ability. This is attributed to the dense and strong Si–O pore-sealing layer formed by the PSZ polymer on MAO.
期刊介绍：
Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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